PC Peripherals USB port problem

Onkar

Disciple
I have a dell inspiron 1564. It has three usb ports, two on the right and one on the left. The two on the right are not functioning . So i got a usb port hub for the port working on the left side. When i connect my dongle (reliance) , after a while the port stops working and it works once i disconnect the dongle and remove the hub and reconnect it into the slot. What should I do?
 
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